Engine piston



' l 1,546,058 C. R. BROWN ET AL 'ENGINE PISTON July 14, 1925.

Flled Feb. 6, 1925 2 Sheets-Sheet J.

' July 14, 1925.

1,545,058 c. R. BROWN ET AL v ENGINE PISTON Patented July 14, 1925.

UNITED STATES `PATENT GFFlCE.

CLAUD B, BROWN AND JESSE F. THOMAS, F NEW LONDON, WISCONSIN.

ENGINE PISTON.

' Application led February 6, 1923. Serial No. 617,322.

VTo all ywhom 'it may cmwem.;

Be it yknown that we, CLAUD R. BROWN and J Essi-3 F. THOMAS, citizens ofthe United States, residing at 1New London, in the county of Waupaca andState of Wisconsin, have invented certain new and useful Improvements inEngine' Pistons; and we do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it' appcrtains tomake and use thesame.

This invention relates to a piston of the type particularly adapted foruse in the cylinders of internal combustion engines.

It is aimed to provide an inexpensive, self-adjusting and non-rattlingpiston to uniformly, expansively and intimately bear against cylinderwall throughout the length and circumference of the skirt of thepiston.y

A second object is to provide a novel piston with which the foregoingobjects and advantagesare attained being supp'li p the mechanic insemi-finished con'v ""1 f' enable machining by him. f

Another object is to provide afc'onstruction of piston having askirt'whof j'outer surface normally extends outwardly beyond thepacking-carrying portion, lor in other words is of greater exteriorldiameter than the packing-carrying portion, which skirt has acircumferential slit, la longitudinal slit extending therefrom towardand terminatin short `of the' free end of the skirt, in com ination witha slit substantially parallel to the latter slit and terminating shortof the circumferential slit.

Another object isto provide a piston having a skirt of the constructionmentioned which is provided with an interior tensioning rib or flange,which may be cast integral with the Skirt. 1

Various additional objects and advantages will become apparent from aconsideration of the description following taken in connection withaccompanying drawings ilustrating Ian operative embodiment thereo Insaid drawings Figure 1 is a view in vertical central section showing thepiston in place in a cylinder of an internal combustion engine;

Figure 2 is a side elevation of the piston alone; v

Figure 3 is an inverted plan view of the piston alone;

rsingle piece.

ed; t0

at the packing-carrying portion as at 14 in Figure 4 is a crosssectional view through the piston on the line 4-4 of Figure 2 pass- Thepiston is generally designated 10 and l in Figure 1 is shown as in usewithin a. conventional cylinder 11 of an internal combustion engine. Itis to be understood that the invention is not limited to such use butymay be employed generally as a piston.

TVhile not essential, piston is preferably of any suitable metal andcast in a It has a closedl head l2 as usual and that portion of thecylindrical wall' adjacent to the same as at 13 is grooved order torecelve rings or packings 15 which bears expansively against the innerwall of the cylinder 11. The skirt 16 is a continuation of the wall 13and therethrough openings 17 at diametrically opposite points are.provided in order to accommodate wrist pins which connect piston rodstothe pistons in order to actuate them.

The skirt 16 is normally ofgreater externaldiameter than the portion 13and the skirt 16 is exteriorly reduced if desired, as at 18, around theopenings 17. Such openings 17 may be provided through bosses 19 integralVwith and extending inwardly from the skirt.

At one or more points, preferably two, and each midway of the lines ofthe openings 17 are circumferential slots or slits 20. Communicatingwith slots 20 are slots 21 which extend longitudinally of the skirt 16and terminate short of the free end thereof.

Parallel with the slits or slots 21 and relatively close thereto areslots or slits 22 which extend inwardly from the free end of skirt 16and terminate short of the slit 20. Slots gree. rlhe slits 20, 21 and 22enabling the skirt to be self-adjusting or self-adapting with respect.to the inner surface of the cylinder, thus always uniformly andintimateparticularly when the latter is compressed Cil and in place asinFigure 1.

Referring to Figure 6, the piston is shown in a semi-finished conditionor state. It differs from the preceding views in that slits 21 do notextend completely to slit 2O as a fin 21, and in 'that slits 22 are notopen at the lower -end of the skirt 16 as a fin 22a'is provided ineachslit 22,. The

iston may be sold in this condition. Said ns- 21a and 22a 'will preventsuch flexure or yielding of the piston as will interfere vwithvmachining thereof, as when it is re.- duced in diameter to fit aparticular cylinder. Before the piston is operatively placed in -acylinder, fins 21a and 22a are removed as by means of a hack saw.

Various changes in the details of construction may be resorted toprovided they fall 'within the -spirit and scope of the invention.

We claim as our invention 1. A piston' havin a skirt provided with acircumferential sllt, and other slits parallel to one another on linescutting said circumferential slit intermediate of its ends, one of thelast mentioned slits intersecting said circumferential slit, and theother slits intersecting the edge of the skirt.

.v 2. A piston having a skirt provided with a circumferential slit, saidskirt having a slit extending therefrom and terminating short of thefree end of the skirt, and said skirt jhaving a slit substantiallyparallel.

with the last slitextending inwardly from its free end wall andterminating short of the circumferential slit, and each of the secondand third mentioned slits being substantially equidistant from theirrespective adjacent ends of thexirst slit. t

3. A piston having a skirt provided with a Vcircumferential sllt, saidskirt having a slit extending therefrom and termmating short 'of thefree end of 'the' skirt, and said skirt having a slit substantially"paralleli with the last slit extending inwardl from its free end Walland terminating sy ort of the circumferential slit and each of thesecond and third mentioned slits being substantially equidistant fromtheir respective adjacent ends of the first slit, said skirt being ofgreater external diameter than the remainder of the istonI so thatI itwill be 'self-fitting, said s 'rt having pin receiv' ing openingstherethrough, the skirt being exteriorly reduced about said openings,vv

bosses about said openings and integral with j the piston, and atensioning flange integral j with and within the piston crossing thesecond and third mentioned slits and merging into the metal of the'skirt and bosses.

In testimony whereof we affix our. signa-v;`

